用C#中的字符串解析化学式？

using System;
using System.Text.RegularExpressions;

public class ChemicalFormulaParser
{
    public static void Main(string[] args)
    {
        string formula = "H2O";
        ParseChemicalFormula(formula);
    }

    public static void ParseChemicalFormula(string formula)
    {
        // 使用正则表达式匹配化学式中的元素和数量
        string pattern = @"([A-Z][a-z]?)(\d*)";
        MatchCollection matches = Regex.Matches(formula, pattern);

        foreach (Match match in matches)
        {
            string element = match.Groups[1].Value;
            string count = match.Groups[2].Value;

            if (string.IsNullOrEmpty(count))
            {
                count = "1"; // 如果没有数量，默认为1
            }

            Console.WriteLine("元素: " + element);
            Console.WriteLine("数量: " + count);
        }
    }
}

元素: H
数量: 2
元素: O
数量: 1